Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet duoc vo snippets" » "viet duc vo snippets", "viet duoi vo snippets", "viet duong vo snippets", "viet duoc va snippets", "viet duoc co snippets", "viet duoc do snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("viet duoc vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet duoc vo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet duoc vo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet duoc vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.